<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="./lib/vue-2.4.0.js"></script>
</head>
<body>
<div id="app">
<!-- 分析： -->
<!-- 1：我们要监听到 文本框数据的改变，这样才能知道什么时候去拼接出一个 fullname -->
<!-- 2：如何监听到文本框的数据改变呢？？？ -->
<input type="text" v-model="firstname" @keyup="getFullname">+
<input type="text" v-model="lastname" @keyup="getFullname">=
<input type="text" v-model="fullname">
</div>
<script>
var vm=new Vue({
el:'#app',
data:{
firstname:'',
lastname:'',
fullname:''
},
methods:{
getFullname(){
this.fullname=this.firstname+'-'+this.lastname
}
}
});
</script>
</body>
</html>